I have already owned a Philips 5806 then for the past fourteen years and kept using it daily sometimes twice a day since. Unfortunately the battery has become weak and I could not get more than two shaves before the battery needed recharging. So I opted out for the Philips HQ 6990 not just as a matter of habit but because so it was very reasonably prices. The new machine proved to be of the same quality and I can get 10 shaves for an hour of charging the battery. I hope to be able to use it for the next fourteen years.